Environment-friendly high-purity cerium dioxide extraction method
A ceria and extraction technology, which is applied in the field of environmental protection extraction of high-purity ceria, can solve problems such as increased production cost, lengthy crystallization steps, and influence on continuous extraction, so as to reduce production cost and environmental protection pressure, and improve extraction efficiency. and distribution ratio, the effect of reducing operating procedures and acid consumption
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Embodiment 1
[0024] A kind of environment-friendly extraction method of high-purity ceria comprises the following steps:
[0025] (1) Extraction: Mix the cerium chloride feed solution (1.2mol / L) and the extractant at a volume ratio of 1:1.2 for extraction and separation, and at the same time add 6% hydrotalcite by weight of the extractant, and carry out ultrasonic dispersion for 25 minutes (ultrasonic The frequency is 25KHz), separated after standing, the solid phase is recovered, and the organic phase is input into the back extraction procedure; the extraction agent is P204 bis (2-ethylhexyl) phosphate extraction agent, including the following raw materials: 25% P204, 8 % 1,2,5-thiadiazo-3,4-dithiol, the balance is kerosene;
[0026] (2) Stripping: Take the oxalic acid solution of 2.0 times the volume of the obtained organic phase, strip it at 55°C, carry out ultrasonic dispersion for 25min (ultrasonic frequency is 35KHz), and precipitate at the same time, and filter to obtain the precipi...
Embodiment 2
[0033] A kind of environment-friendly extraction method of high-purity ceria comprises the following steps:
[0034] (1) Extraction: Mix the cerium chloride feed solution (1.2mol / L) and the extractant at a volume ratio of 1:1.5 for extraction and separation. At the same time, add 6% hydrotalcite by weight of the extractant, and carry out ultrasonic dispersion for 25 minutes (ultrasonic The frequency is 25KHz), separated after standing, the solid phase is recovered, and the organic phase is input into the stripping procedure; the extractant is P204 bis(2-ethylhexyl) phosphate extractant, including the following raw materials: 30% P204, 12 % 1,2,5-thiadiazo-3,4-dithiol, the balance is kerosene;
[0035] (2) Stripping: take the oxalic acid solution of 1.5 times the volume of the obtained organic phase, strip it at 55°C, carry out ultrasonic dispersion for 25 minutes (ultrasonic frequency is 35KHz), and produce precipitate at the same time, and filter to obtain the precipitate; th...
Embodiment 3
[0042] A kind of environment-friendly extraction method of high-purity ceria comprises the following steps:
[0043] (1) Extraction: Mix the cerium chloride feed solution (1.2mol / L) and the extractant at a volume ratio of 1:1.5 for extraction and separation. At the same time, add 6% hydrotalcite by weight of the extractant, and carry out ultrasonic dispersion for 25 minutes (ultrasonic The frequency is 25KHz), separated after standing, the solid phase is recovered, and the organic phase is input into the stripping procedure; the extraction agent is P204 bis (2-ethylhexyl) phosphate extraction agent, including the following raw materials: 25% P204, 12 % 1,2,5-thiadiazo-3,4-dithiol, the balance is kerosene;
[0044] (2) Stripping: take the oxalic acid solution of 1.5 times the volume of the obtained organic phase, strip it at 55°C, carry out ultrasonic dispersion for 25 minutes (ultrasonic frequency is 35KHz), and produce precipitate at the same time, and filter to obtain the pr...
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